- The exam is 100 equally weighted multiple-choice questions in three hours, administered through Kryterion.
- Irrigation Scheduling is the heaviest domain at 20%, followed by Soil-Plant-Water Relationships and Irrigation Management at 15% each.
- Fees are $200 (IA members) or $450 (nonmembers), with retakes at $150/$275.
- Retakes require a 90-day wait, capped at three attempts in two years, then a one-year wait.
Quick Facts Snapshot
This cheat sheet condenses the numbers you actually need to remember before sitting for the Certified Agricultural Irrigation Specialist exam through the Irrigation Association (IA). Bookmark it alongside our full CAIS Study Guide 2026 and revisit it the night before your test date instead of re-reading full chapters.
| Item | Detail |
|---|---|
| Certifying Body | Irrigation Association (IA) |
| Delivery Method | Computer-based via Kryterion; select IA sites offer paper-and-pencil |
| Question Count | 100 multiple-choice, equally weighted |
| Time Allotted | 3 hours |
| Member Fee | $200 USD |
| Nonmember Fee | $450 USD |
| Retake Fee | $150 member / $275 nonmember |
| Registration Lead Time | At least 14 days before the exam |
| Scheduling Window | Within 12 months of registration |
Exam Format & Delivery
The CAIS exam is closed-book, but candidates receive a supplied equation sheet and may use a silent, battery-powered, nonprinting calculator - including programmable models. Smartphones, tablets, and smartwatches are strictly prohibited at the testing station. There is no separate reference booklet beyond the equation sheet, so memorizing formula relationships from your study materials still matters even though raw computation is supported.
Testing happens at Kryterion testing centers for computer-based delivery, with a limited number of IA locations still offering paper-and-pencil administration. There is no essay, simulation, or performance-based component - every question is multiple choice, and each one carries identical weight toward your score. That format simplicity is exactly why understanding what score you actually need to pass matters more than guessing at a percentage threshold.
Key Takeaway
Because all 100 questions carry equal weight, there is no scoring advantage to skipping low-weight domains like Basic Hydraulics (5%) - a missed question there costs exactly as much as one in Irrigation Scheduling (20%).
Domain Weight Breakdown
Nine content domains make up the full blueprint. Irrigation Scheduling leads at 20%, with Soil-Plant-Water Relationships and Irrigation Management tied at 15% each, and Efficiency and Uniformity close behind at 14%. Together, those four domains account for roughly 64% of the exam - a strong argument for front-loading your review time there.
| Domain | Weight |
|---|---|
| Irrigation Scheduling | 20% |
| Soil-Plant-Water Relationships | 15% |
| Irrigation Management | 15% |
| Efficiency and Uniformity | 14% |
| Irrigation Methods | 10% |
| Water Quality, Salinity and Drainage | 8% |
| Chemigation | 8% |
| Basic Hydraulics | 5% |
| Climate Monitoring and Control | 5% |
Irrigation Scheduling (20%)
The single largest domain. Expect questions built around timing decisions - when and how much to irrigate based on crop water needs, evapotranspiration data, and soil moisture depletion.
- Relating crop coefficients to scheduling decisions
- Interpreting soil moisture monitoring data
- Balancing water budgets against crop growth stages
Soil-Plant-Water Relationships & Irrigation Management (15% each)
These two domains together carry as much weight as Irrigation Scheduling. Soil-Plant-Water Relationships covers infiltration, root zone dynamics, and available water capacity, while Irrigation Management focuses on system oversight, decision-making, and operational judgment across a farm or field program.
- Soil texture and water-holding capacity concepts
- Management decisions tied to labor, equipment, and system design tradeoffs
For a full walk-through of every domain's subtopics and question style, see the CAIS Exam Domains 2026 guide. If you're still deciding how much this content actually challenges test-takers, our breakdown on how hard the CAIS exam really is puts the domain weighting in context.
Registration, Fees & Scheduling
Registration must be completed at least 14 days before your intended exam date. For computer-based testing, registering doesn't lock in a specific date immediately - candidates then schedule their session within the following 12 months, giving some flexibility around farm seasons or work commitments.
Pricing depends on IA membership status:
- IA members: $200 USD for the initial exam
- Nonmembers: $450 USD for the initial exam
- Retake (member): $150 USD
- Retake (nonmember): $275 USD
Given the price gap between member and nonmember rates, it's worth checking IA membership costs before you register. A complete cost comparison, including how fees stack against renewal costs over time, is available in our CAIS Certification Cost breakdown.
Retake Rules
If you don't pass on your first attempt, the rules are specific and worth memorizing exactly:
- A 90-day waiting period is required before any retake attempt.
- No more than three total attempts are allowed within a two-year period.
- After a third failed attempt, candidates must wait a full year before trying again.
These constraints make first-attempt preparation genuinely valuable - not just to save money on the $150/$275 retake fee, but to avoid losing months to the mandatory waiting periods. If you want a realistic read on how test-takers actually perform, our CAIS Pass Rate data page covers what's known and what isn't.
Renewal & CEU Requirements
Passing the exam isn't the finish line - CAIS status must be actively maintained. The requirements are:
- Annual renewal fee: $75 for members, $125 for nonmembers
- CEU total: 20 continuing education units every two years
- Irrigation-specific CEUs: at least 10 of the 20 must be irrigation-specific
- Tier 1 water-efficient CEUs: at least 5 must fall in this category
- Ethical compliance: required alongside CEU completion
This means the remaining CEUs (up to 5) can come from broader professional development, but the bulk must stay tightly focused on irrigation and water-efficiency content. Track these categories separately rather than lumping all your CEUs together, since falling short in the Tier 1 water-efficient bucket specifically can jeopardize renewal even if your total CEU count looks fine.
Key Takeaway
Set calendar reminders around your two-year CEU cycle - the 10 irrigation-specific and 5 Tier 1 water-efficient minimums are separate hurdles, not just line items inside the 20-CEU total.
Final-Week Review Timeline
In the last stretch before your test date, sequence your review by domain weight rather than by chapter order. This is the one place a generic study technique - spaced repetition on flashcards - pairs well with CAIS-specific prioritization.
Heavy-Weight Domains
- Irrigation Scheduling (20%) - crop water needs, ET-based timing, soil moisture triggers
- Soil-Plant-Water Relationships (15%) - infiltration, root zone capacity
Mid-Weight Domains
- Irrigation Management (15%) - operational decisions and system oversight
- Efficiency and Uniformity (14%) - distribution uniformity calculations, application efficiency
Supporting Domains
- Irrigation Methods (10%), Water Quality/Salinity/Drainage (8%), Chemigation (8%)
- Practice equation-sheet lookups so you're fast with it on exam day
Light-Weight Domains & Full Review
- Basic Hydraulics (5%) and Climate Monitoring and Control (5%)
- Timed practice questions using a permitted calculator only
Run a full practice session under real time constraints on our CAIS practice test platform before your final review day - three hours for 100 questions leaves roughly 1.8 minutes per question, and you want that pacing to feel automatic, not something you calculate mid-exam.
Who This Credential Signals To
Employers evaluating irrigation staff - agribusiness operations, irrigation equipment dealers, consulting firms, and larger farm operations managing multiple fields - use CAIS as a marker that a candidate can handle scheduling decisions, efficiency calculations, and water quality judgment calls without heavy supervision. If you're weighing whether the credential translates into better job prospects or pay, our CAIS Salary Guide and ROI analysis dig into that question directly. For a running list of roles that reference the credential, check CAIS Jobs.
Frequently Asked Questions
The exam has 100 multiple-choice questions, all equally weighted, with three hours allotted to complete them.
Yes. A silent, battery-powered, nonprinting calculator is permitted, including programmable models. Smartphones, tablets, and smartwatches are not allowed, and a supplied equation sheet is provided since the exam is closed-book otherwise.
The initial exam fee is $200 for IA members and $450 for nonmembers. Retakes cost $150 for members and $275 for nonmembers.
You must wait 90 days before retaking it. You're limited to three attempts within a two-year period, and after a third failure you must wait a full year before trying again.
Pay the annual renewal fee ($75 member / $125 nonmember), complete 20 CEUs every two years - including at least 10 irrigation-specific and 5 Tier 1 water-efficient CEUs - and maintain ethical compliance.